Rooster-red's rooster behavior management page:
https://www.backyardchickens.com/web/viewblog.php?id=2588-Roo_behavior
(e.t.a. -- oops, sorry, I see PortageGirl beat me to it. Sorry! )
ISA Browns are from particular 'trademarked' lines... the offspring of a RIR and a RIW is just a brown (or red, depending who you're asking) sex-link. ISA Browns are brown sex-links; not all brown sex-links are ISA Browns. You can't really tell ISA Browns from other sex-links, reliably, by eye...